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    <h1 id = "biaot">h1这是1级标题</h1>
    <h1>我的第一个标题</h1>
    <h2>This is a heading</h2>
    <h3>This is a heading</h3>
    <p>我的第一个段落</p>
    <p>This is a paragraph.</p>
    <p>This is another paragraph.</p>
    <p>这是<b>一</b>段话<br>这是<u>另一</u>段<i>话</i>啊</p>
    a<sup>2</sup><br>
    H<sub>2</sub>O<br>
    <p>This is <s>another </s> paragraph.</p>
    <p>This is <hr></hr> another paragraph.</p>
    <p>This is <hr> another paragraph.</p>
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    <div style ="font:50px;color:red">
        这是个div测试模块
        <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;水调歌头</p>
        <p>明月几时有，把酒问青天</p>
        <p>不知天上宫阙，今夕是何年</p>
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        <p>兰亭集序</p>
        <p>  &lt; &gt; </p>
        <p> &lt;p&gt; </p>
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    <span style="...">行级标签</span>行级标签测试</br>

    <a href="#biaot">实现回到顶部</a>

    <hr>
    <a href="http://www.w3school.com.cn" >This is a link</a></br>
    <img src="w3school.jpg" width="104" height="142" />
    <p>This is a paragraph.</p>



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